Rock-drill sharpener.



W. A. SMITH.

ROCK DRILL SHARPENER.

APPLICATION FILED IUNE 13. I917.

Patented June 25, 1918.,

2 SHEETSSHEET I.

W. A. SMITH.

' ROCK DRILL SHARPENER.

APPLICATION HLED JUNE l3| 19H.

1 ,970,667. Patented June 25, 1918.

2 SHEETS-SHEET 2.

unrrnn s reams PATENT onmon WILLIAM A. SMITH, OF DENVER, COLORADO, ASSIG-NOR TO THE DENVER ROCK DRILL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORIPORATION OF DELA- WARE.

ROCK-DRILL SHARPENEBI.

Specification of Letters Patent.

Patented June 25, 1918.

To all whom it may concern:

Be it known that I, WVILLIAM A. Snrrrrr, a citizen of the United States, residing at Denver, in the county of Denver and State dated July 17, 1917.

The primary object of the present invention is to provide mechanism of a simple compact character that will effect aquick opening movement of the gripping jaws.

The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a view partially in elevation and partially in section of the apparatus.

Fig. 2 is a detail sectional View through the return plunger and its cylinder.

Fig. 3 is a rear elevation of the same.

Fig. 4 is a detail sectional view on the line 4-4 of Fig. 1.

Similar reference numerals designate corresponding parts in all the figures of the drawings.

In the embodiment illustrated, a suitable base 5 is employed, from which rise spaced standards 6. These standards are connected by a crosspin 7 that is held against turning and accidental detachment by a set screw 8. J ournaled on the pin 7 and located between the standards 6 is a lever 9, one arm of this lever having a suitable gripping jaw 10 cooperating with a stationary jaw 11 carried by the standards, the other arm of the lever having a pivotal connection 12 with a rod 13 of a piston 14 that operates in a vertical cylinder 15 fixed upon the base 5. Projecting from one side of the standards is a horizontal arm 16 which supports the dollying mechanism, not shown.

Motive fluid for the apparatus is supplied from any suitable source through a hose line 17 having a branch 18 connected to valve mechanism 19 by which the supply of fluid to the cylinder 15 and to the dollying mechanism is controlled. The apparatus as thus far described, is disclosed in the aforesaid patent, and no claim is herein made to this mechanism.

In order to secure a quick opening movement to the jaws 10 and 11 by swinging the lever so that the arm carrying the jaw 10 will rise quickly from the jaw 11, the following mechanism is preferably employed. The lever 9 is provided with a third depending arm or projection 20, the rear side of which is rounded as illustrated at 21 and bearing against said rounded side is one end of a plunger 22 that is slidably mounted in a horizontal cylinder 23. The cylinder 23,

piston or plunger 22 and the arm 20 are all disposed between the standards 6, and said cylinder is preferably mounted by having a rear head 23 in the form of a flange that is bolted, as illustrated at 24, to said standard 6. The rear end of the plunger 22 is provided with suitable packing 25, and motive fluid is supplied to the cylinder 23 behind said plunger by means of a branch pipe 26 connected to the hose line 17, as shown at 27, this pipe being also connected to the rear head 23*.

With this construction, it will be evident that while motive fluid is constantly acting against the plunger 22 and said plunger is thus constantly tending to swing the jaws to relatively open position, whenever motive fluid is admitted to the cylinder 15 beneath the piston 14, the latter having a very much greater area than the piston 22-25, the jaws will be closed upon the work with sufficient force to hold the drill during the dollying operation.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of con struction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In drill sharpening apparatus of the character described, the combination with work gripping mechanism including a swinging member, of fluid actuated means for moving the member to .grip the work, and means bearing directly'against'the member to open the apparatus when the means for moving it togripping position is inactive.

2. In drill sharpening apparatus of the character described, the combination with a work gripping mechanism including a swinging member, of fluid actuated means for moving the member to grip the work,

and fluid actuated means of less power hav ing. a portion bearing against the member and constantly acting to opentheapparatus when the means for moving it to gripping position is inactive. I

3, In drill sharpening apparatus of the character described, the combination with .work gripping mechanism inoluding a' swinging member having three'arms, one of said arms having'a gripping jaw, of vmeans engaged with another. arm forswing-ing the member to cause then-jaw to:grip the work,

and means engaged with the third arm to swing the member out ofgrippingrelation with the work. a

'4. In drill sharpening apparatus of the character described, the combination with work gripping mechanism including a swinging member having threearms, one of said arms havinga gripping jaw, of fluid actuatedmeans engaged with anotherarm for swinging the member-to cause ith'e-jaw xtogrip the work, and fluidactuated means engaged with the third arm to swing the member out of gripping relation with the work.

5. In drill sharpening apparatus of the character described, the combination with a base having spaced standards rising therefrom, of alever pivoted between its ends to ing projection to movethe, lever inan opposite direction. 7 I V p a 3 '6. In drill sharpening apparatus of the character described, the combination with a base,of a swingingllever fulcrumed thereon, coacting jaws, one of which is carried by the lever, cylinders of difierent capacities mountedon the base in angular relation to each other, pistons in the cylinders, and

means operated by the pistons forrespectively moving the lever in different directions.

Intestimonywhereof,I aflixmy signature 7 in the presence of two witnesses.

. WILLIAM A SMITH, Witnesses: I

:SULLIvAN V, JOHNSON, v H ALMER G. Gosmrsom Copies ofthlslpatent' may be obtained iorjfive cents each, by addressing the Commissioner of Patents,

Washington, D. G." Y i i 

